// The dropdown wrapper (`<div>`)
.dropup,
.dropright,
.dropdown,
.dropleft {
    position: relative;
}

.dropdown-toggle {
    white-space: nowrap;
    // Generate the caret automatically
    @include caret();
}

// The dropdown menu
.dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    z-index: $zindex-dropdown;
    display: none; // none by default, but block on "open" of the menu
    float: left;
    min-width: $dropdown-min-width;
    padding: $dropdown-padding-y 0;
    margin: $dropdown-spacer 0 0; // override default ul
    @include font-size($dropdown-font-size);
    color: $dropdown-color;
    text-align: left; // Ensures proper alignment if parent has it changed (e.g., modal footer)
    list-style: none;
    background-color: $dropdown-bg;
    background-clip: padding-box;
    border: $dropdown-border-width solid $dropdown-border-color;
    @include border-radius($dropdown-border-radius);
    @include box-shadow($dropdown-box-shadow);
}

@each $breakpoint in map-keys($grid-breakpoints) {
    @include media-breakpoint-up($breakpoint) {
        $infix: breakpoint-infix($breakpoint, $grid-breakpoints);

        .dropdown-menu#{$infix}-left {
            right: auto;
            left: 0;
        }

        .dropdown-menu#{$infix}-right {
            right: 0;
            left: auto;
        }
    }
}

// Allow for dropdowns to go bottom up (aka, dropup-menu)
// Just add .dropup after the standard .dropdown class and you're set.
.dropup {
    .dropdown-menu {
        top: auto;
        bottom: 100%;
        margin-top: 0;
        margin-bottom: $dropdown-spacer;
    }

    .dropdown-toggle {
        @include caret(up);
    }
}

.dropright {
    .dropdown-menu {
        top: 0;
        right: auto;
        left: 100%;
        margin-top: 0;
        margin-left: $dropdown-spacer;
    }

    .dropdown-toggle {
        @include caret(right);

        &::after {
            vertical-align: 0;
        }
    }
}

.dropleft {
    .dropdown-menu {
        top: 0;
        right: 100%;
        left: auto;
        margin-top: 0;
        margin-right: $dropdown-spacer;
    }

    .dropdown-toggle {
        @include caret(left);

        &::before {
            vertical-align: 0;
        }
    }
}

// When enabled Popper.js, reset basic dropdown position
// stylelint-disable-next-line no-duplicate-selectors
.dropdown-menu {
    &[x-placement^="top"],
    &[x-placement^="right"],
    &[x-placement^="bottom"],
    &[x-placement^="left"] {
        right: auto;
        bottom: auto;
    }
}

// Dividers (basically an `<hr>`) within the dropdown
.dropdown-divider {
    @include nav-divider($dropdown-divider-bg, $dropdown-divider-margin-y, true);
}

// Links, buttons, and more within the dropdown menu
//
// `<button>`-specific styles are denoted with `// For <button>s`
.dropdown-item {
    display: block;
    width: 100%; // For `<button>`s
    padding: $dropdown-item-padding-y $dropdown-item-padding-x;
    clear: both;
    font-weight: $font-weight-normal;
    color: $dropdown-link-color;
    text-align: inherit; // For `<button>`s
    white-space: nowrap; // prevent links from randomly breaking onto new lines
    background-color: transparent; // For `<button>`s
    border: 0; // For `<button>`s
    // Prevent dropdown overflow if there's no padding
    // See https://github.com/twbs/bootstrap/pull/27703
    @if $dropdown-padding-y == 0 {
        &:first-child {
            @include border-top-radius($dropdown-inner-border-radius);
        }

        &:last-child {
            @include border-bottom-radius($dropdown-inner-border-radius);
        }
    }

    @include hover-focus() {
        color: $dropdown-link-hover-color;
        text-decoration: none;
        @include gradient-bg($dropdown-link-hover-bg);
    }

    &.active,
    &:active {
        color: $dropdown-link-active-color;
        text-decoration: none;
        @include gradient-bg($dropdown-link-active-bg);
    }

    &.disabled,
    &:disabled {
        color: $dropdown-link-disabled-color;
        pointer-events: none;
        background-color: transparent;
        // Remove CSS gradients if they're enabled
        @if $enable-gradients {
            background-image: none;
        }
    }
}

.dropdown-menu.show {
    display: block;
}

// Dropdown section headers
.dropdown-header {
    display: block;
    padding: $dropdown-padding-y $dropdown-item-padding-x;
    margin-bottom: 0; // for use with heading elements
    @include font-size($font-size-sm);
    color: $dropdown-header-color;
    white-space: nowrap; // as with > li > a
}

// Dropdown text
.dropdown-item-text {
    display: block;
    padding: $dropdown-item-padding-y $dropdown-item-padding-x;
    color: $dropdown-link-color;
}